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Joined: Dec 2000
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I work with a couple of manufacturing companies that have home bases out of the US. We've added 480x380,etc. transformers and odd buck/boost transformers (autotransformers) to spots as needed for the occasional odd voltage (here 277/480Y, 120/208Y are our nominal voltages). I now have been "elected" to find a way to supply 100 volt power. Does anyone have a source for this? I only need about 30KVA, but I'm at a loss for the 100v 60Hz power, as the transformer doesn't seem to be available here in the US, and the manufacturer, in Japan, hasn't responded. Thanks..S
[This message has been edited by electure (edited 12-07-2002).]
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Joined: Apr 2002
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Must the 100 volts be one 2-wire circuit? At 30kVA, that is 300 amperes. Safely designed maybe, but not cheaply.
Could the 100-volt load be split into 3 parts? That could reduce material costs some.
What is the acceptable voltage range for the nominal 100-volt equipment? Is a ~104-volt nominal acceptable?
[This message has been edited by Bjarney (edited 12-07-2002).]
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Yes, Bjarney, a voltage of 104 is acceptable, and a 3Ø system would be fine! The circuits will be be used for industrial process equipment. We're supposed to install a few of the branch circuits now, and the bulk of the capacity is to be used for future expansion. (I've not even seenany of the equipment.)
[This message has been edited by electure (edited 12-11-2002).]
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At http://www.federalpacific.com/literature/drytrans/FPTS-RTB-0701.pdf page 12, you could possibly use a 120:16V 5kVA {SB16N5F} transformer. that would buck 120V to 104V at 313 amperes. Else, if the “30kVA” feed was 4-wire wye, you could use three 2kVA {SB16N2F} transformers, each connected on a per-phase basis. For 2-wire 120-to-104 volts connect 120V and 104V neutrals paralleled to H2/H4, with the 120V “hot” to H1/H3 and X1/X3, and 104V “hot” to X2/X4. Use one 2kVA transformer for each 208Y/120V phase terminal.
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Bjarney, Thanks! I hadn't even thought about bucking this one down with autotransformers. Now they'll have their 104/180Y panel. Now what colors am I going to use for that one? (Only kidding, but heck I've about run out!) Thx...S [This message has been edited by electure (edited 12-20-2002).]
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Been thinking about phase colors...how about puce, salmon and burnt sienna with a putty neutral?
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